Make Path Codable

[Tinder-OscarBerggren]

Made Path codable Added unit tests

I don't know if anyone else is in need of this but we extend Path in our repo and with Swift 6.2 we get this error.

error: extension declares a conformance of imported type 'Path' to imported protocols 'Decodable', 'Encodable'; this will not behave correctly if the owners of 'PathKit' introduce this conformance in the future

For now we solved it by adding @retroactive

[Tinder-OscarBerggren]

I don't know where things are supposed to be placed so please come with feedback